Signal lamp

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

A signal lamp (sometimes called an Aldis lamp or a Morse lamp) is a visual signaling device for optical communication by flashes of a lamp, typically using Morse code. The idea of flashing dots and dashes from a lantern was first put into practice by Captain Philip Howard Colomb, of the Royal Navy, in 1867.

Excerpt from the Wikipedia article “Signal lamp”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Tucker M. Yates, Public domain, via Wikimedia Commons.